Drag-line excavator



Get. 6,1925. La -59% P. BURKE D-RAG LINE EXCAVATOE Filed May 15 924 '5shut --shm-e INVENTOR.

A TTORNEYS Oct. 6, 1925.

P. BURKE DRAG LINE EXCAVATOR I Fi led May 15. 1924, 3 sheets-sheetINVENTOR.

ATTORNEYS Patented Get. 6, 1925.

UNITED STATES PAUL BURKE, OF GREEN BAY, WISCONSIN, ASSIGNOR TO NORTHWESTENGINEERING COMPANY, OF GREEN BAY, WISCONSIN, A CORPORATION OFWISCONSIN.

, DBAG LINE EXCAVATOR.

Application filed May 15, 1924. Serial No. 713,476.

To all whom it may concern:

Be it known that I, PAUL BURKE, a citi zen of the United States ofAmerica, and resident of Green Bay, in the county of Brown and State ofWisconsin, have invented new and useful Improvements in Drag-LineExcavators, of which the following is a description, reference being hadto the accompanying drawings, which are a part of this specification.

The invention relates to drag line excavators.

In the usual drag line excavators the hoisting of the bucket involvesthe expenditure of power greater than that actually required because notonly does the hoisting effort have to overcome the weight of the loadedbucket but also the force exerted through the tensioned drag line whichkeeps the bucket in its filled position. This hoisting effort,therefore, necessitates the use of a power plant which will at leasttake care of the above mentioned operation, and in some instances thisrepresents the maximum power delivered by the machine so that there islittle or nopower left for swinging the loaded bucket, though it isoften desirable to simultaneously hoist and swing the bucket. One of theobjects of this invention is to relieve the hoisting or swinging effortof the force imposed by the tensioned drag line and to actually use thisforce in the power system by-returning it thereto to aid in hoisting orswinging, that is, the arrangement hereinafter described instead ofwasting the power through the maintenance of a braking or tensioningefi'ectupon the drag line is actually put back into the machine by aregenerative'arrangement of the drag line drum with the power plant,thereby minimizing the effort required for hoisting and swinging, orboth, reducing the wear and tear on the drag drum brake and, in someinstances, making it posslble to use a smaller power unit to actuatetheexcavator.

Where the same prime mover, such as an internal combustion engine, isused to effect.

with its load. Such maximum demand,

however, usually lasts for but a small 'frac tion of the operatingcycle, which means that the average load upon the engine is below itscapacity where the engine is designed to meet this maximum load, withthe result that for ordinary operating conditions the engine isoperating under its rated capacity and hence below conditions for bestfuel economy. In actual practice, excavators without the regenerativefeature of the present invention try to meet this maximum load conditionby stopping hoisting during the early moments of the acceleration of therotation above referred to, in order to avoid excessive overload uponthe power plant. By the present invention the regenerative efiect of theloaded bucket and the tensioned drag line may be used, independently ofhoisting, to augment the, power of the engine to meet maximum loadconditions during the early moments of the accelerating of the swingingof the machine, and hence for a given bucket capacity a smaller enginemay be used for furnishing the necessary power, which engine willoperate with good efficiency and with good fuel-economy for all theusual demands placed upon it. .Thus the regenerative elfect of thearrangement hereafter shown and described assists the engine in meetingthe conditions of maximum load during acceler- Jat-ion of the swingingmovement of the machine, particularly when the bucket has picked up anespecially heav load.

The inventio further consists in the several features hereinafter setforth andmore particularly defined by claims at the conclusion hereof.

In the drawings: Fig. 1 is a semi-diagrammatic view of a drag lineexcavator embodying the invention;

Fig. 2 is a detail view showing the turning mechanism, parts beingbroken away and parts being shown in section;

Fig. 3 is a view, partly in section, of mechanism embodying theinvention;

Fig. 4 is a detail view taken on the line 4-4 of Fig. 3, with partsbroken away;

Fig. 5 is a view, similar to Fig. 3, of mechanism embodying-theinvention;

Fig. 6 is a view, similar to Figs. 3 and 5, of mechanism embodying theinvention;

bucket 11 here shown is of well known construction and connectionsbetween said bucket and the lines 12 and 15 are also well known andoperate to keep the digging end of the bucket in an operative positionwhile the drag line is. drawn in and the hoisting lineis slack, and inFig. 1 I have shown the various positions the bucket occupies during itsoperation. In its lowermost position the bucket is shown as having beenlowered and started on its travel toward the machine, and in thenextposition the bucket is shown pulled nearly to the end of its traveland as filled and ready to be moved outwardly to be dumped. Under theseconditions tension is placed on the hoisting line 12 and in the usualconstructions this tension or hoisting effort has to overcome thecombined effect of the weight of the loaded bucket and tension exertedin the drag line 15 through an adjustable brake associated with its drumbecause of the necessity for holding the bucket in its filled positionand the energy required to be applied to the drag line 12 during thisoperation becomes transformed into heat energy largely dissipated at thedrag brake. Under the cooperating influences of the hoisting line 12 andthe drag line 15, the former being overhauled and the latter paid out,the bucket progressively approaches the position shown in full lines andfrom this position is ready to be paid out still further until thedumping is effected by complete release of the drag line and hence thedownward swinging of the bucket and the gravity discharge of its load atthe desired point, the uppermost dotted line position showing the emptybucket ready to be again lowered to receive a load.

Before the bucket has attained the dumping position, however, the boomwill have to be swung to one side or the other to bring the bucket overthe place at which it is desired to dump the material. This swinging maytake place simultaneously with the hoisting operation, or independently.As a practical matter the swinging of a drag line excavator having along boom is a slow operation requiring considerable power to acceleratethe large rotating mass, and inasmuch as it is a long operation swingingis usually started as soon as possible so that it may be accomplishedsimultaneously with hoisting to the greatest extent possible underoperating con ditions.

This condition, involving the hoisting of a relieving the drag linebrake of its custom-- my heavy service.

For more clearly explaining the regenerative action of the arrangementhereinafter described, I have shown one form of craneswinging mechanismsomewhat in detail. The power-driven shaft 36 carries a gear 37 meshingwith a gear 18 on a transmission shaft 19, Figs. 1 and 2. Reversiblegearing mechanism transmits motion to a shaft 20 journalled in the base10 and having a ear 20 meshing with a bull gear 21 on the ase 8 so as toturn the rotating base 10 ineither direction about its supporting base8. The reversible gearing mechanism herein shown consists of gears 22and 23, loose on shaft 19, v

and meshing with a gear 24 on the shaft 20 with clutch means forselectively connecting either of the gears 22 or 23 in driving relationwith the shaft 19 so as to drive the shaft 20 therefrom in the desireddirection. Each gear 22, 23 has a clutch face or drum portion adapted tobe engaged by a clutch member 25 slidably but non-rotatably mounted onthe shaft 19 and normally held out of engagement with the adjacent gearby a spring 26. Each clutch member may be individually moved intooperative position by the operator through the turning of a screw .27from a crank 28, said screw engaging with a shifter rod 29 slidablymounted in a bore 30 in the shaft 19 and engaging a member 31 keyed to athrust bearing 25' for the hub of the member 25 and slidable in a radialslot 32 in the shaft 19. Thus, when the gear 22 is clutched to the shaft19 the base 10 will be turned in one direction and in the oppositedirection when the gear 23 is clutched to said shaft.

i The mechanisms shown in Figs. 3, 5 and 6, each embody a hoisting drum33 loosely mounted on a power-driven or live shaft 34 journalled insupporting bearings 35 on the rotating base 10. The shaft 34 is drivenfrom a power shaft 36, driven from a prime mover 105- on therotatingbase, through a gear 37 on the shaft 36 and a gear 38 keyed tothe shaft 34. The'hoisting drum 33 is adapted to be driven by the shaft34 by connection therewith through any suitable form of clutchmechanismbetween said shaft and drum, and I have here shown the gear 38 asprovided with a friction clutch ,member 439 engageable with the frictionsurfaces of a coacting clutch member formed at one end of the drum 33,the gear 38 being slidably keyed on the shaft 34 for bringing the parts39 and 40 into operative relation, the part 39 being normally held outof contact with the part 40 by a spring 41 interposed between'the drumand the gear and being adapted to be moved into engagement with the part40 by any suitable operating means, such as a shifting member 42slidably mounted in an axial bore in the shaft 34and engaging a bar 43,keyed to a bearing 44in thrust engagement with the hub'of the gear andpassing through a radial slot 45 in the shaft 34, said shifting memberbeing operated from a point outside the shaft by means of a thrust screw46 engageable with the outer end of the member 42 and adapted to beturned by the operator through a crank member or lever 47. The drum isalso pre-,

vented vfrom rotating, when desired, by meanslof a brake of usualconstruction, and hence not shown in detail, includingia band 48. Thegear 38 also meshes with a gear 49 loose .on the drag drum shaft, inFig. 3 designated byfthe numeral50, in Fig. 5 by thenunieral 51 andin'Fig'. 6 by the numeral 52. In'each instance this shafthasthe dragline drum loosely mounted thereon and designated in Fig. 3 by thenumeral 53, in

, Fig. 5 by the numeral 54 and in" Fig- 6 by the numeral 55. In eachinstance the drag line drum is adapted to be driven from the gear 49 bya suitable clutch construction generally similar to that previously described in connection with the hoisting drum, that is, a clutch member56carried by the gear 49 is.frictionally-engageable with clutch surfaces57 ontlie drag line drum bysliding the gear 49' along its shaft so as toeffect the clutch engagement, the member 56 being normally held out ofclutch engagement with the-member 57by a spring],

58' and being movedinto engagement by mechanism including a bearing inthrust engagement with the hub of the gear 49 and, engaged by a shifterbar similar to the'barf 43 identical with the form shown more'indetailin connection with the, hoisting drum peripheral brake surface 59adapted to be engaged by a brake-band 60 operated'in anv desirabl andwell-known manner so as.

to hold the drum against rotation.

The construction thus far described is of a usual and well-known form inthat both the hoisting drum and drag line drum are driven from asuitable source of power and provided with clutches for drivefrom saidsource of power or for release from the these drums the hoisting linemay be let out,

or pulled in and the drag line let out or ulled in to control theoperation of the ucket 11. In the usual construction the brake 60 isapplied to the drag line during the time the bucket is being shiftedfrom its filled dotted line positidnshown in Fig. 1 to its full lineosition, and considerable of the hoisting e ort is therefore wasted inthe form of heat due to this braking action, and it is to obviatethisWaste of power that the constructions herein shown have been providedwith mechanism which provides for the connection between the drag linedrum and the driving mechanism of the machine operable to furnish powerto the machine as the drag'line' is let out during hoisting. I

Forthis purpose, in Fig.3 I have shown the drag line drum as providedwith a clutch face 61 engageable with a clutch member 62 of thecontracting friction band type, which is under the control of, and,

e-nofillustration I show it connected with an idler gear 64 on a shaft65 mounted in suitable bearings 66 on the rotating base 10 and meshingwith a gear 67 connected to the shaft 34 so that it will be rotatedindepend- "ently of drum 53 or with said drum.

The friction band 62 is shown as having .one ende68 connected to a pin69 intermediate the ends of anarm 70 of a bell crank "lever 71 which ispivotally mounted on a pin 72 carried by one of the spokes of the gear63, the other end'73 of the band being connected by a hook bolt 74 withan anchor pin 75 mounted on the outer end of the arm 0, wherebytheswinging of the lever 71 will effect a difference in tension between theends 68 and 73 of the band and cause it to be engaged or disengaged fromthe face 61 of the drag line drum 53.

As a means of effecting movement of the lever 71 to release the band 62,-I show a link 76 operatively connected by its pins 7 7 and 78 with onearm of a bell crank lever 79, pivoted on the gear63, and whose other endpasses through -a slot 80 in the shaft 50 and has a rounded head 81mounted in a slot 82 and engageable with the ends of said slot in ashifting member 83 slidably mounted in an axial bore 84 in the. shaft50, all of these parts, that is the clutch band 62 and its operatingmeans, adapted to revolve with the shaft 50, the member 83 beingoperable from the point outside the shaft by a collar 85 loosely mountedthereon and carrying p-ins86 engaged by-a lever 87 under the eontrol of,the operator, whereby the inward movement of the member 83 by, theoperator will,.through the lever 79, link 7 6 and lever 71,,efi'ect arelease of the band.

' A spring 88 connects one arm of the lever 71 with the gear 63 andexerts through said lever a m-initial tension in the band 62by. a

pull onthe end 73of said band.

;With this clutch construction, when the friction band 62 is rotating inthe direction shown by the arrowl89 at a more .rapid rate than itscoactin'gsurface 61 of the drum 53, itwill exert but a very slighttension upon this friction surface and, hence, will not re strain it.lVhen, however, the speed, ofrotation of drum in the directionindicatedby the arrow 89 tends to become greater thanthe speed ofrotation of theband 62 in the same direction, the initial tension exerted by the spring88 causes the band 62 to wrapitsel't tightly about the friction surface61 so that for the time beingthe drum 53land the gear .63 constitutepractically a rigid unit, revolving with the shaft and in a direction toreturn energy, to the power systemthrough shaft 50, gears 63, 64 and 7to shaft 34 a ndthence through gears-38 and 37 to the shaft '36, thegear] 49 then being free of the'drum 58.

i Considering n'ow Figs. 1 to 4:, inclusive, and starting with thebucket 11 in the lower- Lmost dotted lin e position, the clutch-56,57

for the drag line drum 53 is thrown in imparting, a rotation in a:direction indicated by the arrow 90. .This winds inthe drag line l2,caus i ng the bucket to dig in on its movement toward the machine whilethe hoisting rope lQ is paidout from the then -loose :drumBB under thecontrol of the brake 48. This digg ing or loading operation having beencompleted, as shown bythe loaded bucket in dottedlines in Fig. 1, it isnow desired to move the loaded bucket outwardly in preparation fordumping, as shownin the full lineposition inFig. 1, brake 60 is releasedand the clutch 56, 57 1s di engaged and the drag line l5 is free to bepaid'out under. tenson imparted ,to it by the weight of the loadedbucket, and the tension in the hoisting line 12,'which is now exertedeither by the engagement of the-hoist clutch 39, 40, or by its brake 48,and this pull onythe line15-will rotate the drag line' drurn 53 in 55the opposite direction, that is in the direction of the arrow 89,whereupon acceleration of the drum 53 in this direction causes theautomatic engagement of the band 62 in the manner. previously described,and hence a drive back to the power plant through gears 63, 64 and 67,shaft-34: and gears' 38 and 37, the speed of rotation of the drum 53being limited by the speed of the power plant, and the energy impartedto the'drum 53 through'thepayingout of'the drag line the hub of the 15under, tension is therefore returned to the power system of tl ieina'ehine so that it may be used either'j'for hoisting or swinging-orboth.

*lurther paying out of thedrag line 15 may be interrupted by theapplication of the ,brake to the drag drum 53, thus allowinglt he bucketto be l'sp'otte d over "the point at which it is-desiredltotdump beforefinal dumping is effected through: the release of brake 57. Releaseofthei band 62 may be effected by the operator, in; the mannerpreviously described, a through the outward movement of the member-.83.

It will be noted that introduction o't-pinion or gear 64:provides-thatthemotationof friction band-;62 willbe inthe.c'Li-rection\in" which the drag line drum turns: whilerpay- 'ingout, andfthat it is net'necessanyztomonn ect the gear-63'through*-shafti34=wtozthe hoist" dru'in shaft b ut that a suitableagear- 'in'gconnection directly Witlrthe .:shaft 236 .maybe used to produce-the sameeifect,;.the

showing; here made being a convenientnone jfor explaining the invention.

lniFig'. 5, instead of using an automatic clutch} for effectingaregenerative'. drivei between the drag drum and the power plant, I

show; a clutchsimilar to that shown imcbnnection with the drag clutchpreviously. de-

scribed, that is, tlie=drag d1f=um 54si has clutch surfaces =91 engagedby La clutch vvmemliier-92 on a gear 93* loose onLtheushaft 45.1 am

similar to the gear-63 smesliingzwiith gear-64 which meshes with gear67wfonthethoist drum shaft 34. :As before, a sprin 9.4;.nor-

-'I na lly holds! the r memberr92 .;out .6 driving tiontohpay outthedra'g'iline 15,.the power produced iwillbe transmitted from'ttlie drum54 through. gears 93, 6.4-Iandi-67, toi'thafihaft 34, gearsi38i and--37.to-ctheshaft;36,,and-thus returned to: the .power, system, the lgear 4:9then being. free ofrthe idrum=54J In Figs. 6 and 7 instead ofusingafriction -bandtype of clutch, I showa one-,way clutch forefiecting theregenerative :drive. 1 1m this instance the drag'line vdrum,55 hasflan-internal matchetkwheel, portion v 100, adapted to beengagedbypawls 101 pivotally mounted on .pins'lO2 carried by agearlQEt;and limited in their. release position by step pins 104, said Igear 103:being; 1oose; .on.-the, v shaft 52 .andmeshi'ng with idler pinion 64.which meshes with, gear.-67 on the hoistingdrum shaft 34, said pawlsbeing in engagement with the ratchet wheel 100 when the drum 55 isrotating in a direction to payout the drag line and the clutch 56, 57disengaged, and hence transmitting power to the gears 103, 64 and 67 tothe shaft 34, gears 38 and 37 to the shaft 36, and thus returning power'to the machine, and when the drum is rotating to haul in on the dragline 15 the pawls merely ride over the teeth of the ratchet.

The construction shown in Fig. 3 is preferred, as it hasboth theadvantages of a one-way clutch and a hand-operated clutch.

From the foregoing description itv will be noted that in each of theabove constructions the drag drum may be-regeneratively associated withthe power system when the hoist drum clutch 40, 39 is thrown out andthus operate to return energy to the power 'systemof the machineindependently of the operation of the hoisting drum. This feature isespecially useful when it is desired to swing the rotating'base by theswinging mechanism, for with the hoist clutch 39, 40 thrown out and thebrake 48 applied, when the drag line is paid out to allow the bucket toswing from a position near the machine to anv outer position, the energythereby produced rotates the drag drum in a direction to return energyto the power system so that all the energy thus returned, less only thelosses incident to its transmission, will go .tosaid swinging mechanismor be divided between said swinging or rotating mechanism and thesource-of power.

Thus, it is possible to augment the power of the engine to meet maximumload conditions during the early moments'of accelerating of the swingingofthe machine and hence for a given bucket 'capacity a smaller enginemay be used for furnishing the necessary power, which engine willoperate with good efficiency for all the usual demands made upon it.

For the purpose of illustration, I show in Fig. 1 a prime mover 105connected by gears 106, 107 and 108 to gear 37. I From. the foregoing itwill be observed that by a driving connection between the drag line drumand the power plant of the machine that the torque imparted to said drumduring the paying out of the tention with the power-plant and thebucketoperating mechanism including the drag line and hoisting line, ofmeais for converting the force produced by the-tensioning of the dragline by the bucket into energy delivered back to the power plant withoutoperating said hoisting line.

2 In a drag line excavator, the combination with the hoist drum, hoistline, drag line drum, the drag line and the bucket, of a source ofpower, means for transmitting power to the drag drum to drive it in adirection to load the bucket, and means for transmitting power, impartedto the drag drum by the tensioned drag line as it revolves in thedirection to pay out the drag line,-to said'source of powerindependently of the operation of the hoist drum to increase theavailable power of the machine.

3, In an excavator, the combination, with the bucket, of a hoist drum, ahoisting cable for the bucket associated with said drum, a

drag drum, a drag cable for the bucket as-' sociated with said dragdrum, a source of power, means for connecting said hoist. drum to saidsource of power to hoist said bucket, means for connecting said dragdrum to said source of power for driving it in a direction to wind insaid drag cable, and means for connecting said drag drum with saidsource of power to deliver energy thereto when said drag drum isrotating in the opposite direction under the infiuence of the drag cabletensioned by the bucket andits load and the hoisting cable, saidlast-named means being operable independently of the means forconnecting the hoist drum to said source of power.

4. In a drag line excavator, the combination with a supporting base, ofa rotating. base mounted on said supporting base, a source of power,swin ing mechanism for rotating said rotating ase with respect to ingmechanism when said drag drum is rotating in a direction to pay out saidcable under the influence of tension set up in said cable by the bucketand its load, all the available energy thus returned goin to saidswinging mechanism or being divlded between said swinging mechanism andsaid source of power.

5. In an excavator, the combination with the bucket, of a hoisting drum,a hoisting cable for the bucket associated with said drum, a drag drum,a drag cable for the bucket associated with said drag drum, a source ofpower, means for connecting said drag drum to said source of power fordriving it in a direction to wind in said cable, means for connectingsaid hoisting drum drum, a ucket, a drag cable with said source of powerto wind in said hoisting cable, and means, independent of thefirst-named power connection for the dra drum, for connecting said dragdrum wit said source of power, simultaneously with thewinding in of thehoist cable on the hoisting drum, to deliver energy thereto when saiddrag drum is rotating in the direction opposite to that for winding inthe drag cable.

6. In an excavatonthe combination'with the bucket, of a hoisting drum, ahoisting cable for the bucket associated with said drum, a drag drum, adrag cable for the bucket associated with said drag drum, a source ofpower, means for connecting said drag drum to said source of power fordrivin it in a direction to Wind in said drag ca lo, and means forconnecting said drag drum with said source of ower to deliver energythereto when said rag drum is rotating in the opposite direction underthe influence of the drag cable tensioned by the bucket and its load andthe hoisting cable, said last-named connection automatically remainingout of operation as long as the v speed of rotation of said drag drum,in its power-delivering direction is below a predetermined ratio to thatof the motive power.

7. In an excavator, the combination with thebucket, of a hoisting drum,a hoisting cable for the bucket associated with said drum, a drag drum,a drag cable for the bucket associated with said drag drum, a source ofpower, means for connecting said r drum to said source of power fordrivirin a direction to wind in said drag andmeans for connecting-saiddrag drum with said source of power to deliver energy thereto when saiddrag drum is rotating in the opposite direction under the infiuence ofthe drag cable tensioned by the bi. and. its load and the hoistingcable, said last-named connection automatically remaining out ofoperation as long as the speed of rotation of said drag drum in itspower-delivering direction is below a predetermined ratio to that of themotive power, and automatically becoming Operative when the speedof,rotation of said drag drum in the direction mentioned is e ual to orexceeds the predetermined ratio with that of the motive power;

8. In an excavator, the combination with the bucket, of a hoistingdrum,a hoisting cable for the bucket associated with said drum, a dra drum, adrag cable for the bucket associated with said drag drum, a source ofpower, means for connecting said drag drum to said source of power fordrivin it in a direction to wind in said drag ca le, means forconnecting said drag drum with said source of power to deliver energythereto when said drag drum is rotating in the instance oppositedirection under the influence of the drag cable tensioned by the bucketand its load and the hoisting cable, said last-named connectionautomatically remaining out of operation as long as the speed ofrotation of said drag line in its power-delivering direction is below apredetermined ratio to that of the motive power, and automaticallybecoming operative when the speed of rotation of said drag drum in thedirection dri'ven shaft for driving said drum, a controllable gearingconnection between said power-driven shaft and said drag drum shaft forrotating said drag drum to haul in on the drag line, and a gearingconnection between said shafts regeneratively associating said drag drumwith said powerdriven shaft when said drag drum is rotating in adirection to pay out said drag line.

10. In an excavator, the combination with the swinging mechanism and thebucket, of

a hoisting drum, a hoisting cable for the bucket associated with saiddrum, a drag drum, a drag cable for the bucket assos ciated with saiddrag drum, a source of power, means for connecting said drag drum tosaid source of power for driving it in a direction to wind in saidcable, and means for utilizing the energy derived from the drag drumwhen rotating in a direction to pay out said cable for furnishing powerto said swinging mechanism only.

11. In a drag line excavator, the combination with the bucket, hoistline and drag line, of a drag drum shaft, a drag drum adapted to rotatewith said shaft, a powerdriven shaft, a hoist drum, means including aclutch for connecting said hoist drum with said-power-driven shaft, aclutch-controlled driving. connection between said power-driven shaftand said drag drum shaft for rotating said drag drum" to haul in on thevdrag line, and a clutch-controlled gearing connection between saidshafts regeneratively associating said drag drum with said power-drivenshaft when said drag-drum is rotating in a direction to pay out saiddrag line.

12. In a drag line excavator, the combination with the bucket, hoistline and drag line, of a drag drum shaft, a drag drum adapted to rotatewith said shaft, a powerdriven shaft, a hoist drum, means including aclutch for connecting said hoist drum with said power-driven shaft, aclutch-controlled sociating said drag drum with said power-- drivingconnection between said 'powerdriven shaft when said drag .drum isrodriven shaft and said drag drum shaft for tating at a predeterminedspeed and in a 1 rotating said drag drum to haul in on the direction topay out-said drag line. 5 drag line, and means including an auto- Intestimony whereof, I aflix my signamatlc clutch and gearing connectionsbeture. 1

PAUL BURIE.

tween said shafts, for regeneratively as-

